Documentation is available here
I think you can display the project key by adding $issue.project.name . I haven't tried it though. Give it a try and let me know if this helped.
An easier way than changing the templates is using a plugin such as Intelligent Reporter. Design your template in Word, then choose project name from some drop down menus to place it where you wish. No complex programming or changing the JIRA installation, and you can have as many different templates as you need.
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